Digital BW, The Print

I am trying again to get an answer on this post.
Neutral prints with C84, EZ inks from MIS on Epson Premium Glossy,
using Epson Glossy, Best Photo, and adjusting the sliders will not
give prints where the dark greys match thise on the screen. The prints
are simply too light. It is not the printer- two C84s give nearly
identical results. The prints are acceptable and without metamerism,
but not as good as an R800 glossy (although the R800 prints have
metamerism).
 Has anyone encountered this ?
 Are prints using Epson Matte papers with the C84 & EZ inks too light ?
A reply would be greatly appreciated. 

               Stuart